[all-commits] [llvm/llvm-project] 2f89d4: [SCEV] Split collecting and applying rewrite info ...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2f89d4a8c79a2e88f2749c7460886e0d776f3aff
      https://github.com/llvm/llvm-project/commit/2f89d4a8c79a2e88f2749c7460886e0d776f3aff
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-07-02 (Tue, 02 Jul 2024)

  Changed paths:
    M llvm/include/llvm/Analysis/ScalarEvolution.h
    M llvm/lib/Analysis/ScalarEvolution.cpp

  Log Message:
  -----------
  [SCEV] Split collecting and applying rewrite info from loop guards (NFC) (#97316)


Introduce a new LoopGuards class to track info from loop guards and split 
off collecting rewrite info to LoopGuards::collect. This allows users of 
applyLoopGuards to collect rewrite info once in cases where the same
loop guards are applied multiple times.

This is used to collect rewrite info once in howFarToZero, which saves a
bit of compile-time:
stage1-O3: -0.04%
stage1-ReleaseThinLTO: -0.02%
stage1-ReleaseLTO-g: -0.04%
stage2-O3: -0.02%

https://llvm-compile-time-tracker.com/compare.php?from=117b53ae38428ca66eaa886fb432e6f09db88fe4&to=4ffb7b2e1c99081ccebe6f236c48a0be2f64b6ff&stat=instructions:u

Notably this improves mafft by -0.9% with -O3, -0.11% with LTO and
-0.12% with stage2-O3.

PR: https://github.com/llvm/llvm-project/pull/97316



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